| Blacy | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Blacy 51.svg |
| Arrondissement: | Vitry-le-François |
| Canton: | Vitry-le-François-Champagne et Der |
| Insee: | 51065 |
| Postal Code: | 51300 |
| Mayor: | Dominique Parnisari[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 48.7281°N 4.5542°W |
| Elevation M: | 101 |
| Area Km2: | 17.26 |
Blacy (in French pronounced as /blasi/) is a commune of the Marne department in northeastern France.